US4597969A - Stabilization of unstable drugs or food supplements - Google Patents
Stabilization of unstable drugs or food supplements Download PDFInfo
- Publication number
- US4597969A US4597969A US06/462,115 US46211583A US4597969A US 4597969 A US4597969 A US 4597969A US 46211583 A US46211583 A US 46211583A US 4597969 A US4597969 A US 4597969A
- Authority
- US
- United States
- Prior art keywords
- weight
- parts
- compound
- efrotomycin
- magnesium hydroxide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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- 239000003814 drug Substances 0.000 title abstract description 16
- 230000006641 stabilisation Effects 0.000 title abstract description 15
- 238000011105 stabilization Methods 0.000 title abstract description 15
- 235000015872 dietary supplement Nutrition 0.000 title abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 65
- 229950003445 efrotomycin Drugs 0.000 claims abstract description 41
- 239000008187 granular material Substances 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 27
- 235000010443 alginic acid Nutrition 0.000 claims abstract description 25
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- ZLBGSRMUSVULIE-GSMJGMFJSA-N milbemycin A3 Chemical class O1[C@H](C)[C@@H](C)CC[C@@]11O[C@H](C\C=C(C)\C[C@@H](C)\C=C\C=C/2[C@]3([C@H](C(=O)O4)C=C(C)[C@@H](O)[C@H]3OC\2)O)C[C@H]4C1 ZLBGSRMUSVULIE-GSMJGMFJSA-N 0.000 claims abstract description 6
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- ASOJLQIBBYOFDE-HCHBIZCOSA-N chembl2106443 Chemical compound C(/[C@H]1O[C@H]([C@H]([C@H]1O)O)[C@H](C)[C@H](OC)C(/C)=C/C=C/CNC(=O)[C@@H](CC)[C@]1(O)[C@@H]([C@H](O[C@H]2[C@@H]([C@H](OC)[C@H](O[C@H]3[C@@H]([C@H](O)[C@@H](OC)[C@H](C)O3)OC)[C@@H](C)O2)O)C(C)(C)[C@H](\C=C\C=C\C)O1)O)=C\C=C\C=C(/C)C(=O)C1=C(O)C=CN(C)C1=O ASOJLQIBBYOFDE-HCHBIZCOSA-N 0.000 claims abstract 8
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- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000000655 nuclear magnetic resonance spectrum Methods 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000008363 phosphate buffer Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 230000003389 potentiating effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 235000010413 sodium alginate Nutrition 0.000 description 1
- 239000000661 sodium alginate Substances 0.000 description 1
- 229940005550 sodium alginate Drugs 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 101150035983 str1 gene Proteins 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000005720 sucrose Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000007916 tablet composition Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- CZDYPVPMEAXLPK-UHFFFAOYSA-N tetramethylsilane Chemical compound C[Si](C)(C)C CZDYPVPMEAXLPK-UHFFFAOYSA-N 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 238000005550 wet granulation Methods 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
- A61K9/16—Agglomerates; Granulates; Microbeadlets ; Microspheres; Pellets; Solid products obtained by spray drying, spray freeze drying, spray congealing,(multiple) emulsion solvent evaporation or extraction
- A61K9/1605—Excipients; Inactive ingredients
- A61K9/1611—Inorganic compounds
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K20/00—Accessory food factors for animal feeding-stuffs
- A23K20/10—Organic substances
- A23K20/163—Sugars; Polysaccharides
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K20/00—Accessory food factors for animal feeding-stuffs
- A23K20/10—Organic substances
- A23K20/195—Antibiotics
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23K—FODDER
- A23K20/00—Accessory food factors for animal feeding-stuffs
- A23K20/20—Inorganic substances, e.g. oligoelements
- A23K20/24—Compounds of alkaline earth metals, e.g. magnesium
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K9/00—Medicinal preparations characterised by special physical form
- A61K9/14—Particulate form, e.g. powders, Processes for size reducing of pure drugs or the resulting products, Pure drug nanoparticles
- A61K9/16—Agglomerates; Granulates; Microbeadlets ; Microspheres; Pellets; Solid products obtained by spray drying, spray freeze drying, spray congealing,(multiple) emulsion solvent evaporation or extraction
- A61K9/1605—Excipients; Inactive ingredients
- A61K9/1629—Organic macromolecular compounds
- A61K9/1652—Polysaccharides, e.g. alginate, cellulose derivatives; Cyclodextrin
Definitions
- the present invention relates to the stabilization of drugs including antibiotics and food supplements. Particularly, it concerns the granulation of Efrotomycin, milbemycins, tylosin derivatives, e.g., A.I.V. (3-acetyl-4"-isovaleryl tylosin), antibiotics B-5050 and tetrahydro-B-5050, Ivermectin, mocimycin, goldinomycin and the like in alginic acid and magnesium hydroxide. It has been found that the granules so obtained exhibit unexpectedly enhanced stability and can be incorporated into various formulations without substantial decomposition. When the drugs or food supplements are administered to animals, the formulations include animal feed, pellets or feed premix.
- the formulations include animal feed, pellets or feed premix.
- Efrotomycin (FR-02A) is a new antibiotic which also exhibits growth-promoting activity. It is effective against both gram-positive and gram-negative bacteria and accordingly is useful in the treatment of a broad spectrum of infections in animals. Efrotomycin is disclosed in U.S. Pat. No. 4,024,251 issued May 17, 1977 to Maiese and Wax. The antibiotic is isolated from the fermentation broth of Streptomyces lactamfuran by solvent extraction and is believed to have the molecular structure as follows: ##STR1##
- FR-02A as the ammonium salt is soluble in alcohol and chloroform. It is moderately soluble in water at pH 7.0 or higher.
- a U.V. spectrum of the ammonium salt in water showed:
- the nuclear magnetic resonance spectrum of antibiotic FR-02A was obtained at 100 MHz with CDCl 3 as the solvent and tetramethylsilane (TMS) as the internal standard. Representative features of the spectrum were Doublets at 1.21(3H), 1.31(3H), 1.74(3H), 4.63(1H), 4.87(1H), 5.94(1H) and 7.32(1H) ppm. Overlapping signals of 4 other C-methyl groups centered at about 0.94 ppm; Singlets at 1.65(3H), 2.02(3H), 3.15(3H), 3.42(3H), 3.45(3H), 3.54(3H), and 3.58(3H) ppm.
- Efrotomycin is found to be unstable at elevated temperatures especially in the presence of moisture and feed components.
- a premix is blended into animal feeds followed by injection of steam resulting in a final temperature of 85°-100° C.
- the mixing process takes about 2-15 minutes.
- the agglomerates may be either cooled and dried to produce a mash feed or extruded to give pelleted feed.
- Efrotomycin must be stabilized first before it can be incorporated into animal feeds.
- alginic acid For efrotomycin incorporation of alginic acid gives the best stabilization although all the polysaccharides including those listed in Table 1 and xanthan gum, karaya gum, gum ghatti, and carrageenan offer significant protection.
- the method of the present invention is not limited to Efrotomycin. Any other unstable animal drugs or food supplements may be incorporated into animal feeds or other formulations including human drug formulations according to the formula and process described herein. Particularly, for example, the following drugs:
- Ivermectin a potent antiparasitic agent disclosed in U.S. Pat. No. 4,199,569.
- Milbemycins antibiotics characterized in U.S. Pat. Nos. 4,144,352; 3,950,360; and British Patent Specification No. 2,056,986.
- Tylosin and derivatives e.g., A.I.V.: antibiotics disclosed in U.S. Pat. No. 4,092,473.
- A.I.V. is the 3-acetyl-4"-isovaleryl derivative (R 1 is acetyl and R is isovaleryl in formula I) of tylosin.
- Antibiotics B-5050 and tetrahydro-B-5050 disclosed in U.S. Pat. No. 3,853,842.
- these drugs may also be stabilized by granulation with a polysaccharide gelling agent especially alginic acid blended with an inorganic salt, particularly metal oxides or hydroxides such as magnesium hydroxide.
- a polysaccharide gelling agent especially alginic acid blended with an inorganic salt, particularly metal oxides or hydroxides such as magnesium hydroxide.
- the granules may be incorporated into feed, tablets, capsules, or other formulations.
- the present invention concerns a method of granulation for the stabilization of unstable or heat-sensitive animal drugs or food supplements, such as Efrotomycin, tylosin and derivatives (A.I.V.), milbemycins, avermectins such as Ivermectin, mocimycin, goldinomycin and the like.
- the granulation enables the incorporation of these drugs or food supplements into animal feeds or other formulations without substantial decomposition.
- the stabilizing granulation formula of the present invention comprises:
- a polysaccharide gelling agent especially guar gums (natural or synthetic), tragacanth, acacia, alginic acid and its salts and derivatives, starch, locust bean gum, agar-agar, xanthan gum, karaya gum, gum ghatti and carrageenan or a mixture thereof; and
- a metal salt especially an oxide, a hydroxide, a carbonate or a silicate of aluminum, calcium or magnesium, for example, magnesium hydroxide.
- the formula comprises:
- Efrotomycin while it is unstable in the below described feeds and feed additives, does not appear to be unstable to water alone.
- the instant process is not a strict protection method against hydrolysis.
- the instant formulation protects antibiotics against deterioration in the presence of feeds. Applicants do not wish to be bound by theory, but this may be accomplished by isolating the compound from the components of feed which cause the deterioration.
- any compound which is intended for use in feed or feed-like components, and which is unstable in such feeds or feed-like components, but otherwise stable under neutral conditions will benefit from the use of the process of this invention.
- the active compound is mixed and agglomerated with other ingredients in the indicated amounts.
- a sufficient amount of a solvent for example water; lower alkanol especially C 1-6 alcohol such as ethanol and methanol; and lower alkanone especially C 1-6 alkanone such as acetone and diethylketone or a mixture thereof is added and thoroughly dispersed to obtain a wet mass of the desired consistency.
- the amount of the solvent needed is about 0.05-2 parts per part by volume of the mixed ingredients.
- the wet blend is sieved, dried, and screened to yield granules of desired sizes.
- the mixing can be carried out in a high speed mixer granulator followed by milling and drying in a fluidized bed.
- the granulated product defined above may also be obtained by dry compression of the ingredients in the indicated amounts followed by subsequent grinding in order to get the granulated product.
- the mixed ingredients may be slurried with a suitable solvent and spray dried into granules.
- the amount of biologically active compound in the granules may be adjusted up to the most convenient range-e.g., from 0.1 percent to 70 percent by weight--for facilitating the dispersion of the compounds in the feed, and the resulting composition (granules) is then dispersed in any suitable feed, premix substrate or simply used as premix by itself.
- the granules are dispersed in animal feed, it is usually incorporated at the rate of about 0.1-10 kg per ton preferably 0.5-2 kg per ton to achieve the desired dose.
- the active compound for example, Efrotomycin
- the active compound for example, Efrotomycin
- alginic acid and magnesium hydroxide An adequate amount of water or other solvent is added to obtain a wet mass of required consistency.
- the resulting agglomerate is then granulated by passing through a 16 mesh (1000 ⁇ m) screen and dried at about 30°-60° C., preferably at about 45° C. for about 5-48 hours, usually about 15-20 hours.
- the granules may be rescreened through a 30 mesh (595 ⁇ m) or other suitable screen to obtain the required size.
- the mixing can be carried out in a high speed mixer granulator followed by milling and drying in a fluidized bed at about 30° C. to 55° C. for about 1-5 hours.
- the formulation may be admixed with suitable inert diluents such as lactose, sucrose, calcium phosphate or micro-crystalline cellulose.
- suitable inert diluents such as lactose, sucrose, calcium phosphate or micro-crystalline cellulose.
- Disintegrating agents e.g. starch or its modifications
- lubricants such as magnesium stearate, stearic acid, polyethylene glycol or talc may be added.
- the blend may be filled into capsules or compressed into tablets to allow the administration of stabilized drugs, e.g., Ivermectin, as a convenient oral dose.
- a wet blend was prepared from mixing the following components:
- Alginic acid 13.33 parts by weight
- the wet blend was sieved 16 mesh, dried at 45° C. for 2 hours and then rescreened 30 mesh.
- the dried granule was used as a "concentrate" which may then be blended with other inert ingredients, e.g., oiled rice hulls and then incorporated into animal feed at the rate of 0.5-2 kg per ton to achieve the appropriate dose.
- the stabilization of Efrotomycin was achieved in both the premix and feed as shown below in Table III.
- a wet blend was prepared from mixing the following components.
- Alginic Acid 18.33 parts by weight
- the wet blend was treated as described in Example 1 and the stabilization achieved in feed is shown below.
- a wet blend was prepared by mixing the following components.
- Alginic acid 45.8 parts by weight
- the wet blend was treated as described in Example 1 and the stabilization in feed is shown below.
- a wet blend was prepared by mixing the following components.
- the wet blend was treated as described in Example 1 and the stabilization in feed is shown below.
- a wet blend is prepared by mixing the following components.
- Alginic acid 22.9 parts by weight
- the wet blend is treated as described in Example 1.
- a wet blend was prepared by mixing the following components.
- the wet blend was treated as described in Example 1 and the stablization in feed is shown below.
- a wet blend was prepared by mixing the following components.
- Alginic acid 45.8 parts by weight
- the wet blend was treated as described in Example 1 and the stabilization in feed is shown below.
- a wet blend was prepared by mixing the following components.
- Alginic Acid 33.33 parts by weight
- the wet blend was treated as described in Example 1 and the stabilization in feed is shown below.
- a wet blend was prepared by mixing the following components.
- Ivermectin 1 part by weight
- Alginic acid 49.5 parts by weight
- the wet blend was treated as described in Example 1 and the stabilization in feed is shown below.
- a blend is prepared by mixing the following components.
- Ivermectin 2 parts by weight
- Alginic acid 32.5 parts by weight
- Magnesium stearate 0.5 parts by weight
- the blend is then compressed on a suitable tablet machine to produce thin compacts which are then milled to produce granules of about 0.5 mm diameter.
- the blend may be passed through a roller compacter followed by screening.
- the granule is then incorporated into feed as described in Example 1.
- a wet blend is prepared by mixing the following components.
- Alginic acid 40 parts by weight
- the wet blend is treated as described in Example 1.
- the active granule is blended with a portion of the dibasic calcium phosphate and then incorporated with the flavor, microcrystalline cellulose and bone meal flour.
- the mix is blended to ensure homogeneity of Ivermectin, the magnesium stearate added and mixing continued for 3 minutes before compression on a suitable machine.
- Each tablet contains 75 ⁇ g of Ivermectin.
- the active ingredient, starch and magnesium stearate are blended together.
- the mixture is used to fill hard shell gelatin capsules of a suitable size at a fill weight of 120 mg per capsule.
- Example 2 Following the procedure of Example 1, a protected wet blend containing mocimycin was prepared. The protected wet blend was granulated and incorporated into mash or feed pellets containing 100 ppm of mocimycin. The stability was noted as follows (percentages of original after the indicated time period):
- the unprotected drug has a stability of less than 25% after 2 months at 37° C.
- Example 2 Following the procedure of Example 1 a protected wet blend containing goldinomycin was prepared. The protected wet blend was granulated and incorporated into feed. The stability is rated as follows:
Abstract
Description
TABLE 1 ______________________________________ The effect of the addition of polysaccharide gelling agents to magnesium hydroxide on the stability of efrotomycin stored in animal feed at 50° C., (all contain 5% efrotomycin and magnesium hydroxide:gum in the weight ratio 1:1). Magnesium Storage % of initial Polysaccharides hydroxide time remaining ______________________________________ -- -- 17 days 12 -- present 25 days 56 Guar gum (anionic) present 28 days 71 Guar gum (nonionic) present 28 days 79 Guar gum (cationic) present 28 days 55 Tragacanth present 28 days 68 Acacia present 28 days 81 Alginic acid present 35 days 100 Calcium alginate present 56 days 82 Sodium alginate present 30 days 69 Maize starch present 14 days 90 Locust Bean gum present 14 days 83 Agar-agar present 14 days 80 ______________________________________
TABLE 2 ______________________________________ The effect of alginic acid - magnesium hydroxide ratio on the stability of efrotomycin stored in animal feed at 50° C. (all contain 10% efrotomycin). % of initial % Magnesium % Alginic remaining after hydroxide w/w acid w/w 4 months storage ______________________________________ 90 -- 26 75 15 73 60 30 91 45 45 93 30 60 100 15 75 75 -- 90 37 ______________________________________
TABLE III ______________________________________ Stability of unprotected and protected Efrothomycin (100 ppm) in feed and pelleted feed. (Concentrate) contains 20% by weight Efrotomycin; mean ± 1 std. deviation) Stability in feed Stability in (w/w % initial) pelleted feed Storage Efrotomycin Concentrate (w/w % initial) Conditions (60% pure) Concentrate ______________________________________ 2 wks 40° C. -- -- 90.4 ± 13.1 50° C. -- 87.3 ± 13.3 80.7 ± 11.8 17 days 40° C. 22.1 ± 4.5 -- -- 50° C. 11.9 ± 3.3 -- -- 4 wks 40° C. 16.5 ± 6.3 75.0 ± 8.1 88.5 ± 5.7 50° C. Trace 73.1 ± 13.3 66.5 ± 4.7 6 wks 40° C. 10.5 ± 3.2 74.6 ± 4.2 98.2 ± 10.2 50° C. Trace 78.8 ± 8.1 64.3 ± 3.67 12 wks 40° C. -- 106 ± 12.7 75.0 ± 8.1 ______________________________________
______________________________________ Stability in feed Storage conditions (w/w % initial) ______________________________________ 4 wks 40° C. 91.3 ± 7.9 50° C. 81.9 ± 8.7 7 wks 40° C. 89.8 ± 8.6 50° C. 72.1 ± 0.5 12 wks 40° C. 96.0 ± 9.6 ______________________________________
______________________________________ Stability in feed Storage Conditions (% initial) ______________________________________ 9 weeks at 50° C. 99 ± 9 ______________________________________
______________________________________ Stability in feed Storage Conditions (w/w % initial) ______________________________________ 4 weeks at 50° C. 83 ± 4 8 weeks at 50° C. 82 ± 5 ______________________________________
______________________________________ Stability in feed Storage Conditions (w/w % initial) ______________________________________ 14 days at 50° C. 90 ± 8 28 days at 50° C. 83 ± 9 56 days at 50° C. 67 ± 8 ______________________________________
______________________________________ Stability in feed Storage Conditions (w/w % initial) ______________________________________ 18 days at 50° C. 94 ± 2 56 days at 50° C. 83 ± 2 5 months at 50° C. 82 ± 4 ______________________________________
______________________________________ Storage Conditions Stability (%) ______________________________________ In Mash 12 weeks at 37° C. 93 ± 6 12 weeks at 37° C. (Sodium Salt) 113 ± 7 Pellets 12 weeks at 37° C. 84 ± 11 12 weeks at 37° C. (Sodium Salt) 93 ± 8 ______________________________________
______________________________________ Stability in feed (w/w % initial) Protected Storage Conditions Ivermectin Ivermectin ______________________________________ 7 days at 40° C. 90 -- 14 weeks at 40° C. 82 -- 4 weeks at 50° C. -- 85 ______________________________________
______________________________________ Milligrams Ingredient Per Tablet ______________________________________ Ivermectin granule 1.5 Bone meal flour 300 Microcrystalline cellulose 500 Flavor 250 Dibasic calcium phosphate 739.5 Magnesium stearate 9 ______________________________________
______________________________________ Milligrams per Ingredient Capsule ______________________________________ Ivermectin granule as 10 prepared in Example 9 Starch 109 Magnesium Stearate 1.0 ______________________________________
______________________________________ In mash 6 weeks at 30° C. 100% 6 weeks at 37° C. 99% In pellets 6 weeks at 30° C. 96% 6 weeks at 37° C. 83% ______________________________________
______________________________________ Storage Conditions Stability (%) ______________________________________ 6 weeks at 37° C. 97% ______________________________________
Claims (19)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US06/462,115 US4597969A (en) | 1982-04-05 | 1983-02-01 | Stabilization of unstable drugs or food supplements |
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---|---|---|---|
US36541882A | 1982-04-05 | 1982-04-05 | |
US06/462,115 US4597969A (en) | 1982-04-05 | 1983-02-01 | Stabilization of unstable drugs or food supplements |
Related Parent Applications (1)
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US36541882A Division | 1982-04-05 | 1982-04-05 |
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US4597969A true US4597969A (en) | 1986-07-01 |
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US06/462,115 Expired - Lifetime US4597969A (en) | 1982-04-05 | 1983-02-01 | Stabilization of unstable drugs or food supplements |
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Cited By (20)
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US4834957A (en) * | 1984-10-17 | 1989-05-30 | Martin Marietta Corporation | Concentrated suspension of aqueous magnesium oxide |
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US5525353A (en) * | 1994-04-22 | 1996-06-11 | Aquacenter, Inc. | Ambient temperature-processed aquatic animal feed and process for making same |
WO2000018406A1 (en) * | 1998-09-28 | 2000-04-06 | Glaxo Group Limited | Oral dosage formulations comprising (2s,3s,5r) -2-(3,5- difluorophenyl) -3,5-dimethyl -2-morpholinol and an effective stabilizing amount of alginic acid |
US6132507A (en) * | 1997-12-01 | 2000-10-17 | Wacker Siltronic Gesellschaft Fur Halbleitermaterialien Ag | Process and device for the production of a single crystal |
CN1096268C (en) * | 1993-03-24 | 2002-12-18 | 奴布卢克实验室有限公司 | Tylosin containing sustained release veterinary compositions |
WO2003030653A2 (en) * | 2001-10-05 | 2003-04-17 | Rubicon Scientific Llc | Animal feeds including actives and methods of using same |
US6716448B2 (en) * | 2001-10-05 | 2004-04-06 | Rubicon Scientific Llc | Domesticated household pet food including maintenance amounts of ivermectin |
US20040180078A1 (en) * | 2002-11-13 | 2004-09-16 | Huber Gordon R. | Extruded foodstuffs having maintenance level actives |
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